On 03/22/2011 02:11 PM, Ruslan Zasukhin wrote:
> On 3/20/11 1:11 PM, "Matt Fowles" <[email protected]> wrote:
>
> Hi Matt,
>
>> Ruslan,
>
>> Try:
>>
>> query_expression
>> : query_term (( "union" | "except" )^ "all"? query_term)*
>> -> ^(QUERY_EXPRESSION $query_expression)
>> ;
>
> Well, $ not helps. Still same
> error 165 uses rewrite syntax and also an ast operator
>
> As I understand,
> -> is re-write syntax
> ^ is AST operator ...
Sounds like ANTLR is being picky and not letting you mix both AST
construction and rewrite rules in the same production. You *could* try
the following:
query_expression
: qe -> ^(QUERY_EXPRESSION $qe)
;
qe : query_term (( 'union' | 'except' )^ 'all'? query_term)*
;
Now one rule has the AST construction, and the other the rewrite rule.
--
Kevin J. Cummings
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